Select from our high-performance low-to-medium voltage semiconductor switches optimized for lithium battery protection and fast charging pipelines.
An in-depth engineering assessment on optimization parameters, thermal design, and drop-in alternative qualification methods for battery protection circuits (1S to 20S applications).
For high-capacity lithium battery protection boards, conduction loss is directly determined by the drain-source on-resistance ($R_{DS(on)}$) at the corresponding gate drive voltage ($V_{GS}$ = 4.5V, 2.5V, or 1.8V). By transitioning to Shielded Gate Trench (SGT) architectures, current semiconductor generation delivers a significantly minimized Figure of Merit (FOM = $R_{DS(on)} \times Q_g$).
This allows design engineers to run higher currents through smaller footprints such as DFN3X3-8 and DFN5X6-8 without thermal overload, improving overall power density in tight electronic enclosures.
Supply chain resilience dictates that engineers specify alternate components early in the design cycle. Using WINSOK's proprietary silicon process, direct equivalent cross-references can be established for standard market components (such as Nexperia, STMicroelectronics, and Infineon equivalents).
When selecting a cross-reference, key parameters including drain-to-source breakdown voltage ($V_{(BR)DSS}$), continuous drain current ($I_D$), and maximum gate threshold voltage range ($V_{GS(th)}$) must match or exceed the target specifications to preserve functional safety margins.
Technical Insight: When operating MOSFETs in parallel configuration for high-current BMS applications (such as 100A continuous output for energy storage units), threshold voltage ($V_{GS(th)}$) matching is critical. Variations in threshold parameters can cause unequal current sharing during the switching transitions, leading to single-device thermal stress and potential avalanche failure.
| Typical BMS Cell Configuration | Required Vds Rating | Optimal Package Options | Key MOSFET Performance Target | Target Applications | |
|---|---|---|---|---|---|
| 1S - 2S (3.7V - 7.4V) | 12V - 24V | SOT-23, DFN3X3-8, SOP-8 | Vgs(th) < 1.0V, ultra-low Rds(on) @ 2.5V | TWS earbuds, Smartphones, Smartwatches | |
| 3S - 5S (11.1V - 18.5V) | 30V - 40V | DFN5X6-8, TO-252 | Rds(on) < 2mΩ, robust body diode recovery | Cordless Power Tools, Vacuum Cleaners | |
| 7S - 13S (25.9V - 48.1V) | 60V - 80V | TO-220, DFN5X6-8, TO-263 | Low Qg, high avalanche energy ruggedness (Eas) | E-bikes, Electric Scooters, AGVs | |
| 14S - 20S (51.8V - 74V) | 100V - 150V | TO-220, TO-263, DFN5X6-8 | Optimized thermal resistance (Rthjc), low Qgd | Light EV, Telecom Backup Power, Solar ESS |
Active MOSFET Models
Package Formats
Direct Cross Compatible
Typical Lead Times
HONGKONG Olukey INDUSTRY CO., LIMITED is a solution provider focusing on the overall solution of electronic product components. The main products mainly include: WINSOK MOSFET, Cmsemicon MCU, PCBA circuit board solution development and other three types of product lines.
At present, the products of Olukey Industry are widely used in automotive electronics, military electronics, smart industry, new energy, smart medical care, 5G, Internet of Things, smart home, and various consumer electronics products. Relying on the advantages of global general agents of major original factories, we are based in the Asia-Pacific market. Provide customers with various advanced high-tech electronic components by using comprehensive superior services, assist manufacturers in producing high-quality products and provide comprehensive services.
Maximizing supply chain elasticity, product performance reliability, and engineering integration support.
We use comprehensive high-quality services to provide customers with various types of advanced high-tech electronic components, assist manufacturers in producing high-quality products and provide comprehensive services. Over the years, the company has relied on reputation to survive, adhering to the tenet of "quality first, service first", and has established good cooperative relationships with many high-tech enterprises and original manufacturers at home and abroad.
WINSOK MOSFET's product voltages are mainly medium and low voltage: 15V, 20V, 30V, 40V, 60V, 80V, 100V, 120V, 150V, 200V, 250V, 300V, 400V, 500V, 600V, 650V. The main packages include DFN3X3-8, DFN5X6-8, TO-252, TO-263, SOP-8, SOT-23, TO-220, etc. There are more than 600 models and more than 40 packages. Extensive coverage of medium-voltage and low-voltage MOSFET product lines on the market.
Cmsemicon MCU is a microcontroller company born in Shenzhen, with rich product types and technology research and development experience. Together with our active components, we can supply complete hardware designs that drastically reduce engineering overhead.
As global supply chains continue to experience unpredictability, China-based semiconductor factories offer unparalleled stability and efficiency. By localizing raw materials, silicon processing, and advanced assembly lines within the Pearl River Delta industrial cluster, we achieve high manufacturing efficiency and scale.
OLUKEY leverages direct integration with state-of-the-art Chinese fab houses. This connection ensures continuous wafer allocation even during global semiconductor shortages, maintaining a stable flow of components to global markets.
Supply Chain Security: Our factory-direct channels eliminate intermediate distributor markups and verify direct authenticity, mitigating the risk of counterfeit components getting into your production stream.
Enabling seamless compliance verification and engineering support across geographic regions.
Our manufacturing and processing facilities conform to top industry standards. All in-stock power MOSFET designs comply with RoHS and REACH directives, ensuring environmental safety throughout the product's lifespan. Automated testing fixtures verify performance parameters at wafer level and individual package levels.
For demanding fields, we provide components compliant with key safety requirements, facilitating easier system integration and device safety validation.
We provide localized engineering support to help streamline the switch to alternate parts. Our Field Application Engineering team assists customers with schematic reviews, PCB thermal design validation, and troubleshooting switching anomalies.
Providing direct channels for custom parameter configurations and packaging adaptation helps developers minimize technical obstacles and accelerate time-to-market.
Broad utility across diverse industry sectors demanding high performance and safety.
Electric scooters, power-assisted bicycles, and automated guided vehicles require rugged protection switches. Using 60V to 100V N-channel MOSFET alternatives (like WSR135N15 or WSD40200DN56G) provides high current capacity and protection against sudden load spikes.
Lithium-ion cordless tools demand exceptionally low on-resistance to prevent thermal build-up during heavy use. Packages like TO-252-2L and DFN5X6-8 offer low thermal resistance (Rthjc), maintaining stable temperatures during prolonged peak discharge cycles.
Ultra-compact platforms, including mobile device chargers and wearables, rely on space-saving footprints. WST2007 (SOT-363) and WSD20L50DN33 (DFN3x3) maintain efficient power management while keeping circuit board footprint to a minimum.
Crucial technical clarifications for component validation and implementation.
Explore additional medium-to-high voltage components designed for robust power protection and energy storage.
Contact Hongkong Olukey Industry to check inventory levels, request free samples, or obtain component cross-reference charts.
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